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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c1f26413bb96858f21c5ac7e6b33afbb373ab869bee37f351ba084cf880150a' 
  AND token = 'EL6QXeeBdrtjtfimDWccSUA/m63gSVGNXS/0USaahN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}